Residual tension strength study of fatigued open-hole titanium-graphite hybrid composite laminates

Citations Over TimeTop 11% of 1998 papers

Abstract

Titanium-Graphite (Ti-Gr) hybrid composite laminates utilize layers of monolithic titanium alloy and graphite reinforced polymer matrix composite (PMC) to form a material that has potential advantages over either material alone. This study addresses the potential advantage with respect to damage tolerance for Ti-Gr laminates by demonstrating the residual tension strength capabilities of fatigued Open-Hole Tension (OHT) laminates with cracks in the titanium layers. Ti-Gr laminates are pre-cracked in fatigue cycles until the cracks in the outer layer of titanium reach predetermined lengths of 1.27 mm, 3.18 mm, 6.35 mm, and 12.70 mm. Three lay-ups are used in this study, including titanium dominant (4T1-2C-2C), 0° PMC dominant (2Ti-6C-2C), and thick laminate (7Ti-12C4C) lay-ups. For specimens containing a 12.70-mm precrack, the titanium dominant lay-up demonstrates an 81% strength retention relative to baseline specimens of no precracks. The 0° PMC dominant and the thick TiGr lay-up demonstrate a retention of 98% and 92% respectively. Retention strengths for shorter precrack lengths, representative of lesser damage cases are equivalent to or higher than those previously listed. Results from this study show that limited fatigue cracks in the titanium layers of TiGr laminates do not significantly affect the residual tension strength of the material.

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